This thinker posited that we become aware of our spirit through internal reflection in a book that proposes an instrumental theory of motion. One work by him argues that materialism will invariably lead to skepticism and rejects another philosopher's distinction between primary and secondary characteristics. This author of 
This thinker posited that we become aware of our spirit through internal reflection in a book that proposes an instrumental theory of motion. One work by him argues that materialism will invariably lead to skepticism and rejects another philosopher's distinction between primary and secondary characteristics. This author of De Motu maintained that the world exists only when imagined by another being in a work that states that "to be is to be perceived". For 10 points each, name this British philosopher who wrote Treatise Concerning the Principles of Human Knowledge and Three Dialogues Between Hylas and Philonous.
This thinker posited that we become aware of our spirit through internal reflection in a book that proposes an instrumental theory of motion.
Bishop George {Berkeley} [{BARK}-{lee}]